Electrical measuring instrument.



No. 648,546. Patented May I, I900. J. F. BEGOLE.

ELECTRICAL MEASURING INSTRUI JENT.

(Application filed Sept. 28, 1899.) (No Model.) 3 Shuts-Sheet I.

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E Nonms PETERS an momu'mou WASHINGTON. u. c.

No. 648,546. Patented May I, I900.

J. F. BEGOLE.

ELECTRICAL MEASURING INSTRUMENT.

(Application filed Sept. 28 1899.) (No Mqdel.) 3 Shaets-Sheet 2.

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Patented May I, I900;

.1. r. BEGOLE. ELECTRICAL MEASURING INSTRUMENT (Applicatioh filed Sept.28, 1899.) (No Model.) 3 Sheets-Sheet 3 4 J. F. Be'gole THE Non UNITEDSTATES PATENT OFFICE.

JosnUA F. BEGOLE, on sr.LoUIs,u1ssoURI.

ELECTRICAL MEASURING INSTRUM ENT.

SPECIFICATION forming part of Letters Patent No. 648,546, dated May 1,1900.

Application. filed September 28, 1899- Serial No. 731,911. (No model).To all whom it may concerns Be it known that I, JOSHUA F. BEGOLE, acitizen of the United States, residing at the city of St. Louis, in theState of Missouri, have invented a certain new and useful ElectricalMeasuring Instrument, of which the following is such a full, clear, andexact description as will enable any one skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, forming part of this specification.

One object of my invention is to provide an electrical measuringinstrument in which the turning force will be substantially uniform forequal increments of current, and thus enable a substantially-uniformscale to be used.

Another object of my invention is to so construct the instrument thatthe action of the coil will tend to lift the weight of the moving parts,thus reducing the friction on the pivot, and hence making the instrumentmore delicate.

Still another object'of my invention is to provide means for impartingto the moving parts an auxiliary turning force during the first part ofthe movement, thereby enabling the instrument to measure smallquantities of current.

My invention consists, primarily, of a rotating indicator, a coiltraversed by the current to be measured and inclined to the axis of saidindicator, andan armature carried by said indicator, the sameinclination being maintained between said .coil and. armature throughoutthe travel of said armature.

My invention also consists in other novel features and details ofconstruction, all of which are described in the following specificationand pointed out in the claims affixed hereto.

In the accompanying drawings,which illustrate an electrical measuringinstrument made in accordance with my invention, Figure 1 is atop planView. Fig. 2 is a section on the line2 2 of Fig. 1, the indicator beingshown in a different position. Fig. 3 is a section on the line 3 3 ofFig. 1, the parts being shown in the same position as in Fig. 2. Fig. 4is a diagrammatical view showing the manner of winding the coils. Figs.5 and 6 are views of modified forms of armature. Fig. 7

is a view showing a detail of construction. Fig. 8 is a section on theline 8 8 of Fig. 1, the parts being shown in the same position as Fig.2. Fig. 9 is a view similar to Fig. 8, but showing a slight modificationand showing the parts in the same position as in Fig. 1; and Fig. 10 isa section showing a detail.

Like marks of reference refer to similar parts in the several views ofthe drawings.

15 is a base-plate, to which are secured two coil-supports 16, a curvedscale-plate 17, and a curved trough 18, adapted to contain oil or thelike and act as a dash-pot to quiet 01' dampen .the vibrations of thepointer. EX- tending upward from the coil-supports 16 are two posts 19,the tops of which are connected by a bar 20. Carried by lugs 21,extending inwardlyfrom the coil-supports 16, is an in verted-U-shapedframe 22. (Best shown in Fig. 3.) Carried by each of the coil-supports16 is a coil 25. The coils 25 are inclined in opposite directions, asbest shown in Figs. 8 and 9, and are wound, as indicated in Fig. 4:, sothat the current will flow in opposite directions in them.

26 is a shaft the lower end of which rests in a bearing 27 Fig. 2, inthe U-shaped frame 22, and the upper end in a bearing 28 in a plug 29,carried by-the cross-bar 20. Carried bythe shaft 26 is a U-shapedarmature, consisting of a horizontal bar 31 and twodownwardly-projecting blades 32, which enter the coils 25. The bar 31may be made of aluminium or other non-magnetic metal and the blades 32only of magnetic metal, as iron, as shown in Figs. 1, 3, 4, and 9, orthe entire armature may be made of iron, as shown in Figs. 5 and 6. Theblades 32 may also be turned, as shown in Fig. 6, so that their edgesare presented to the coils instead of their faces, as shown in theotherviews of the drawings. In the modification shown in Fig. 9 theblades 32 extend below the coils 25, and the lower parts of said bladesmove farther into the magnetic field of said coils as the armaturerotates, while in the construction shown in the other views of thedrawings the upper parts of the blades move farther into the magneticfield as the armature rotates. By the construction shown in Fig. 9 theforce projects into the trough 18, which, as above described, acts as adash-pot to dampen the vibrations of the pointer 36. The pointer 36 isheld in its normal position by a spring 40,

one end of which is secured to the shaft 26 r 5 and the other to a pin41, carried by a disk 42; The disk 42 isIarranged so that it can be re.-tated to regulate the tension of the spring 40, 43, Figs. 8 and 10,represents U -shaped guards, of iron or other magnetic material, whichare placed over the upwardly-inclined ends of the straight portions ofthe coils when an armature entirely of iron is used in order to cut offa portion of the magnetic field generated by said straight parts ofthecoils 2 5 from the cross-bar 31 of the armature.

When current is passed through the coils 25, the parts being in theposition shown in Fig. 1, the armature is thrown around in the directionof the arrows in Fig. 1, the wings 3o 32 passing farther into themagnetic field of said coils as said field increases with the cur- 1 Asthe inclination of the wings to the rent. coils remains the samethroughout the travel a uniform scale.

form a larger field, while if a good magnetic conductor is provided forthe said lines they On 5 this account when thestraight parts of the 1coils 25 are not protected by the guards 43 the field generated'by saidstraight parts will extend vupwardly, so as to bring the bar 31 of Incase the bar 31 Q will be concentrated in said conductor.

the armature within it. of the armature is made of iron the effects ofthe field generated by said straight parts of i c the coils 25 will beto throw the said bar at right angles thereto, thus giving an auxiliaryimpulse to the armature during the first part of its travel and enablingvery small quanti- 1' ties of current to be measured. In case the guards43 are used the magnetic flow gener- 1 ated by the straight parts of thecoils 25 will beconcentrated in said guards, and consequently cut offfrom the bar 31 of the arma- If it is desired to entirely eliminatev theeffect of the straight part of the coils on the bar 31, the guards 43may be made wide enough to cover the entire straight part of the l coilsadjacent to the side bar; but if it is desired to only eliminate a partof the effect narrow guards may be used, such as are shown 5 in thedrawings.

In case the wings 32 extend below the'coils 25, as shown in Fig. 9, thelifting power of the said coils tends to raise the wings, andconsequently all the moving parts, thus decreasing the friction on thepivot 27 and increasing the delicacy of the instrument.

I amaware that electrical measuring instruments have heretofore beenmade in which a shaft inclined to a coil has been provided with a plateor armature which was also inclined to said shaft so that theinclination of the armature to the coil varied throughout itstravel, andtherefore do not claim such construction.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent of the United States, is-

c 1. In an electrical measuring instrument, the combination with arotary member, of a coil inclined to the axis of said rotary member, alateral arm carried by said rotary member, and an armature-blade carriedby said lateral arm and extendingtherefrom into said coil.

2. In an electrical measuring instrument the combination with apivotally-moun'ted member, 'of a coil inclined to the axis of saidpivotally-mounted member, and an armatureblade carried by saidpivotally-mounted member and parallel therewith. V

3. In an. electrical measuring instrument, the combination with apivotally-mounted member, of a coil inclined to the axis thereof, and anarmature-blade carried by said pivotally-mounted member, the sameinclination being maintained between said blade and coil throughout thetravel of said pivotallymounted member, said blade projecting below saidcoil, whereby the action of said coil will tend to lift saidpivotallymounted member.

4. In an electrical measuring instrument,

the combination with a pivotally-mounted member, of two coils oppositelyinclined to the axis of said pivotally-mounted member, and twoarmature-blades carried by said pivotally-mounted member and projectinginto said coils. v

5. In an electrical measuring instrument, the combination with apivotally-mo'unted member, of two coils oppositely inclined to the axisof said pivotally-mounted member and wound in opposite directions, andtwo armature-blades carried by said "pivotallymounted member andprojecting into said coils.

6. In an electrical measuring instrument I0 their straight partsadjacent, and two armature-blades carried by said pivotally-mountedmember parallel to its axis and projecting into said coils.

In testimony whereof I have hereunto set my hand and affixed my seal inthe presence [5 of the two subscribing witnesses.

JOSHUA F. BEGOLE. Witnesses: W. A. ALEXANDER, DAVID STANNARD.

